Kettle base



FIG. 1 is a front isometric view of a kettle base, showing our new design;

FIG. 2 is a rear isometric view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a rear elevation view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in FIG. 8 depict a portion of the kettle base that forms no part of the claimed design. 

CLAIM The ornamental design for a kettle base, as shown and described. 